linux-kernel - Re: [PATCH v3 1/2] irqchip/sifive-plic: Enable/Disable external interrupts upon cpu online/offline

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Date:   Sun, 8 Mar 2020 13:59:31 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Atish Patra <atish.patra@....com>
Cc:     linux-kernel@...r.kernel.org, Anup Patel <anup@...infault.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
        Anup Patel <anup.patel@....com>, Borislav Petkov <bp@...e.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        James Morse <james.morse@....com>,
        Jason Cooper <jason@...edaemon.net>,
        linux-riscv@...ts.infradead.org,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Steven Price <steven.price@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Vincent Chen <vincent.chen@...ive.com>
Subject: Re: [PATCH v3 1/2] irqchip/sifive-plic: Enable/Disable external
 interrupts upon cpu online/offline

On Mon,  2 Mar 2020 15:11:45 -0800
Atish Patra <atish.patra@....com> wrote:

> Currently, PLIC threshold is only initialized once in the beginning.
> However, threshold can be set to disabled if a CPU is marked offline with
> CPU hotplug feature. This will not allow to change the irq affinity to a
> CPU that just came online.
> 
> Add PLIC specific CPU hotplug callbacks and enable the threshold when a CPU
> comes online. Take this opportunity to move the external interrupt enable
> code from trap init to PLIC driver as well. On cpu offline path, the driver
> performs the exact opposite operations i.e. disable the interrupt and
> the threshold.
> 
> Signed-off-by: Atish Patra <atish.patra@....com>
> Reviewed-by: Anup Patel <anup@...infault.org>

Both patches queued for 5.7 (please add a cover letter when sending a
patch series).

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...